Carl Sagan showing how it was determined the Earth was not flat thousands of years ago...
Adam Rifkin stashed this in Science!
Carl Sagan Globular Earth Deduced by Eratosthenes...
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Top Reddit comment:
Eratosthenes only tools were sticks, eyes, feet, and brains.
B.o.B is clearly missing a tool.
2000+ Reddit comments:
https://reddit.com/r/videos/comments/436ynk/carl_sagan_showing_how_it_was_determined_the/
10:07 PM Jan 30 2016